I found the Spicer manual in digital form online and down loaded it for nothing. The manufacurer's own documentation is almost always the best. The Dodge factory serice manual is also a good choice, very good documentation on the axles and pretty much everything else you need to know about repairing your truck, all in one book.
If you can't find the Spicer manual let me know and I can send it to you when I'm at the putor it's on.
Steve g